Skip to content
Home/Radon Testing/Montgomery County/Bethesda, MD
Radon testing
A continuous monitor on the lowest level that could be used regularly, read every hour for at least 48 hours. The written result comes the day we collect it.
4.9 rating, over 4,000 reviews NRSB-certified technicians Serving Montgomery County
A radon test in Bethesda is $185, or $175 when it is added to a home inspection. That is the whole price: both visits, the monitor for the full 48 hours, and the written report with every hourly reading in it. One residential test covers one Bethesda dwelling. Call when a condominium desk, tenant or separate unit affects access. If a sale involves an estate, relocation company or tenant, identify the person authorized to approve entry.
Day 1
Drop-off
A technician places it on the lowest level that could be used regularly, following EPA placement limits and the intended use of the space, inside a two-hour arrival window. With a home inspection, placement happens during the inspection visit.
48 hours
The house stays closed
For a short-term real-estate test, EPA guidance calls for closed-building conditions for at least 12 hours before the test and throughout the measurement. Windows stay closed, exterior doors open only for normal entry and exit, and the monitor logs hourly readings that help document the test conditions during the minimum 48-hour measurement.
Day 3
Pick-up and report
A technician picks the monitor up in another two-hour window and pulls the full record on the spot. The written report reaches you the same day.
NRSB-certified technicians. Our own team, certified by the National Radon Safety Board, not a subcontractor.
EPA testing guidance. Placement, closed-house conditions and the 48-hour minimum follow it, and your average is read against the EPA action level of 4.0 pCi/L.
Continuous monitors. Airthings Corentium Pro instruments, logging every hour for the whole test.
Appointment times are requests until our team confirms them. What the number means, how to prepare the property and the eight questions everyone asks are on the radon testing page; this page is about Bethesda.
Montgomery County is EPA Zone 1. County classification supports testing, while a Bethesda home’s own reading provides the address-level evidence.
The adopted Bethesda Downtown plan covers roughly 450 acres and addresses housing, affordable housing, parks and redevelopment. That downtown scope should not be extended to every Bethesda neighborhood. A downtown condominium buyer may need seller, agent and front-desk cooperation, while a detached-home owner may control both visits directly. In either case, clear a stable indoor location away from drafts and heat. Tell the technician about a separate apartment or future lower-level bedroom before placement, since each dwelling and intended regular-use level affects scope.
Local background: Bethesda primary housing context, Maryland Department of Health radon guidance, EPA Map of Radon Zones.
01
The 450-acre plan supplies downtown context only; the appointment follows the actual service address.
02
Give the precise unit and arrange lobby, elevator and unit entry twice. Confirm desk hours for collection.
03
A currently vacant lower room matters if it could be used regularly later.
Where we test in Bethesda, and what to tell us
Edgemoor, Bradley Hills
In Edgemoor or Bradley Hills, include any future lower-level office, bedroom or recreation room in the placement discussion.
Glen Echo Heights, Maplewood-Alta Vista
For Glen Echo Heights or Maplewood-Alta Vista, schedule a stable period without remodeling or furniture moves near the device.
Wildwood and the recent rebuilds
At Wildwood or a recent rebuild, do not use construction date as a substitute for testing the individual home.
We do not install radon systems, so we have nothing to gain from your number. If the result is at or above the EPA action level of 4.0 pCi/L, you choose who fixes it. Once the system is in, we can test again and tell you what it reads.
Maryland's residential disclosure framework includes radon among the hazardous or regulated materials covered by an owner's actual knowledge for certain single-family residential property of four or fewer units. The statute has enumerated exemptions and does not itself require a radon test. County and municipal requirements may differ, so check the rules for the property's location and type before relying on an existing result.
Md. Real Property section 10-702. Current as of September 2026. General information, not legal advice.
Yes. New construction does not establish the indoor radon level; test the individual residence.
The appointment covers the selected unit, with separate authorization needed for other units or common spaces.
Identify any lowest-level room that could support routine living, sleeping, work or recreation.
Allow time for placement, the full measurement period, retrieval and reporting before the contract deadline.
Book online or call (703) 450-6398.
Schedule a radon test Request a price
NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
